Firefighters ventilate smoke, superheated, poisonous, or explosive gases for safety and visibility. This allows firefighters to get inside the building to find and extinguish the fire, thereby reducing property damage. This also reduces the chance of a possible dangerous explosion. The environment inside a burning building is not like the movies portray it. Often firefighters cannot see their hands in front of their faces. They crawl to try and remain below smoke and heat and feel their way through the hostile environment. Reducing the smoke in the building allows more efficient rescue and extinguishment of the fire.